Manley Billet 100mm crank - Cracked
I thought all cranks has holes on both side of journal. K1 does. You guys with the Manley billet cranks, I thought one of #4 rod journal oil ports was installed backwards. I thought I saw both teardrops facing each other instead of in same direction.
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there are two methods of drilling a crank oil passage..
the stock crank has such holes that go trough the journal and those are connected to the main bearing with a hole that goes from the outside of the big end right into the middle of the main journal. This means that you ahve to cap that hole on the outside of the big end and leaves more room for dirt to gather inside the oil holes..
The other method is straight shot oiling and there you have these holes that go directly from the big end journal right down to the main bearing journal. As a consequence of the angles involved you get oval holes on the big end which seem to be a stress point. It was long been considered that the straight shot oiling was better, but as we see, if it is not done correctly you get stress raisers..
the stock crank has such holes that go trough the journal and those are connected to the main bearing with a hole that goes from the outside of the big end right into the middle of the main journal. This means that you ahve to cap that hole on the outside of the big end and leaves more room for dirt to gather inside the oil holes..
The other method is straight shot oiling and there you have these holes that go directly from the big end journal right down to the main bearing journal. As a consequence of the angles involved you get oval holes on the big end which seem to be a stress point. It was long been considered that the straight shot oiling was better, but as we see, if it is not done correctly you get stress raisers..
there are two methods of drilling a crank oil passage..
the stock crank has such holes that go trough the journal and those are connected to the main bearing with a hole that goes from the outside of the big end right into the middle of the main journal. This means that you ahve to cap that hole on the outside of the big end and leaves more room for dirt to gather inside the oil holes..
The other method is straight shot oiling and there you have these holes that go directly from the big end journal right down to the main bearing journal. As a consequence of the angles involved you get oval holes on the big end which seem to be a stress point. It was long been considered that the straight shot oiling was better, but as we see, if it is not done correctly you get stress raisers..
the stock crank has such holes that go trough the journal and those are connected to the main bearing with a hole that goes from the outside of the big end right into the middle of the main journal. This means that you ahve to cap that hole on the outside of the big end and leaves more room for dirt to gather inside the oil holes..
The other method is straight shot oiling and there you have these holes that go directly from the big end journal right down to the main bearing journal. As a consequence of the angles involved you get oval holes on the big end which seem to be a stress point. It was long been considered that the straight shot oiling was better, but as we see, if it is not done correctly you get stress raisers..
Hopefully this new oil port was polished up to prevent fracturing. I couldn't see a difference from the pictures, but your pictures didn't show a closeup of the oil ports. GL!